Size- and state-selected cluster chemistry

摘要

New aspects of size- and state-specific properties of carbon cluster are described on the basis of experimental evidence obtained by a recently developed cluster-beam apparatus. Two topics are addressed. One is the spin states for small carbon neutral clusters. Focusing effects induced by a hexapole magnetic field were examined for the carbon clusters from C$-1$/ to C$- 6$/. The second topic is the study of cluster-solid surface interactions. Electron emission processes induced by collision of negative cluster ions with MoS$-2$/ single crystals were investigated in detail, paying special attention to the electron emission efficiency as a function of both size and incident kinetic energy. A new collision-induced phenomenon has been found, which may be closely related to an electron detachment of negative ions induced by the surface potential of the solid target.